Region
Utah
7
Arizona
6
Montana
5
United States
5
Idaho
4
New Mexico
3
California
2
Custer County
2
Custer County (Mont.)
2
Nevada
2
Oregon
2
Wyoming
2
Benton County
1
California Desert National Conservation Area (Calif.)
1
Coconino County (Ariz.)
1
Colorado
1
Duchesne County
1
Duchesne County (Utah)
1
El Malpais National Conservation Area
1
El Malpais National Conservation Area (N.M.)
1
El Malpais National Monument
1
El Malpais National Monument (N.M.)
1
Kern County
1
Kern County (Calif.)
1
Linn County
1
Marion County
1
Polk County
1
Powder River County
1
Powder River County (Mont.)
1
Tulare County
1
Tulare County (Calif.)
1
Wasatch County
1
Wasatch County (Utah)
1